Structural motion of water-resisting key strata lying on overburden

Water-preserved mining is one of the important parts of the 'Green Mining' technological system. The purpose of water-preserved mining is to prevent water from bursting out in coal mines and thus to protect water resources. The principle of water-resisting key strata (WKS) is proposed to establish a model capable of guiding and developing water-preserved mining technology. The experimental model of the WKS is constructed following requirements of the Data Image Correlative Method (DICM). Five experimental schemes are designed according to different combined patterns of the WKS. The water-resisting performance of the WKS is analyzed from observation of structural stability. All of them provide referential value for water-preserved mining.